#include <iostream>
#include <windows.h>
#include <string>
#include <filesystem>

using namespace std;

extern "C"
__declspec(dllexport) int Pow(int num, int exp) {
	for (int i = 1; i < exp; i++)
		num *= num;

	return num;
}

extern "C"
__declspec(dllexport) bool Compare(int a, int b) {
	return a > b;
}

extern "C"
__declspec(dllexport) double SpeedConverter(double speed, string unit) {
	if (unit == "kmh") {
		cout << "Speed in Mile: " << speed * 0.621371 << endl;
		return speed * 0.621371;
	}
	else if (unit == "mph") {
		cout << "Speed in Km: " << speed * 1.60934 << endl;
		return speed * 1.60934;
	}
	else {
		cout << "Error speed Type! Unit: kmh or mph!" << endl;
		return -1;
	}
}

extern "C"
__declspec(dllexport) wstring FindSmallestFileInFolder() {
	wstring folderPath;
	wcout << L"Введите путь к папке: ";
	wcin >> folderPath;

	

	WIN32_FIND_DATA findFileData;
	HANDLE hFind = FindFirstFile((folderPath + L"\\*").c_str(), &findFileData);
	wstring smallestFilePath;
	uintmax_t smallestSize = numeric_limits<uintmax_t>::max();

	if (hFind != INVALID_HANDLE_VALUE) {
		do {
			if ((findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0) {
				wstring filePath = folderPath + L"\\" + findFileData.cFileName;
				uintmax_t fileSize = findFileData.nFileSizeLow;

				if (fileSize < smallestSize) {
					smallestSize = fileSize;
					smallestFilePath = filePath;
				}
			}
		} while (FindNextFile(hFind, &findFileData) != 0);

		FindClose(hFind);
	}

	if (!smallestFilePath.empty()) {
		wcout << L"Самый маленький файл находится по пути: " << smallestFilePath << endl;
	}
	else {
		wcout << L"В указанной папке нет файлов" << endl;
	}

	return smallestFilePath;
}